How to Cool a Mattress? | Stop Sleeping Hot

A mattress that sleeps hot usually traps body heat in dense foam or blocks airflow with a solid base and plastic-y protector. The fix is to reduce heat retention from both the bed itself and the room around it. Start with the setup changes below, then adjust bedding and the sleeping environment — most sleepers notice a real difference within a night or two.

Why Some Mattresses Sleep Hot

Dense memory foam is the most common culprit. Its structure conforms tightly to your body, which limits air movement and holds in warmth. Innerspring, hybrid, and latex builds are more breathable because air can move through open coil systems or the natural pore structure of latex.

Your bed base matters just as much. A solid platform or a box spring with no ventilation blocks airflow from underneath, turning the whole mattress into a heat sink. The Sleep Doctor points out that airflow under the mattress is essential for dissipating the heat your body puts off at night.

Setup Changes That Cool a Mattress Fast

Start with the structure beneath you — these changes cost nothing and work immediately. Air circulation under the mattress is the single biggest factor you control.

• Switch to a slatted base: A slatted bed frame or open platform lets air move freely under the mattress. A solid base traps heat all night.
• Raise the bed slightly: Even an inch or two of extra clearance under the frame improves airflow. Bed risers work well if your frame sits low.
• Remove heat-trapping layers: Pull off thick underlays, extra foam toppers, and non-breathable protectors. Each layer adds insulation.
• Ditch plastic-y waterproof covers: These trap body heat and moisture. Swap to a moisture-wicking mattress protector that breathes while still guarding the bed.

While you have the bed stripped, let the mattress air out for a few hours. Overnight moisture sinks into the foam, and airing it during the day helps it dry completely. Don’t remake the bed immediately if you want maximum drying — Leesa’s cooling guide recommends leaving it exposed so trapped moisture can escape.

What Bedding Actually Cools You Down

Fabrics sit between you and the mattress all night, so breathability here matters almost as much as the mattress itself. Natural fibers beat synthetics for temperature regulation.

Choose cotton percale, linen, or bamboo sheets. These materials wick moisture and let air pass through, unlike thick synthetic blends or sateen weaves that trap warmth. Sleep in cotton or bamboo sleepwear for the same reason. If your pillow contributes to overheating, a cooling pillow or a breathable pillowcase helps reset your sleep microclimate.

A cooling mattress topper or pad helps most when the surface itself feels warm. Place it directly between you and the mattress — that separation from the heat-retaining layer below is what does the work. Gel-infused toppers and pads with breathable covers are common options; check the product’s instructions for setup and care.

For side sleepers especially, the right surface makes a real difference in nighttime temperature and comfort. Our tested roundup of the best cooling mattress for side sleepers compares breathable builds that stay cool through the night.

Room Temperature Tricks That Help

The room does the heavy lifting alongside the mattress. Most sources suggest keeping the bedroom between 60–65°F for restful, cool sleep. If the room runs hot, lower the thermostat before bed so the mattress isn’t doing all the cooling work.

These low-effort steps compound with the bedding changes above:

• Run a ceiling fan counter-clockwise in summer — this pushes air straight down for a direct cooling effect on fans with a reversible switch.
• Use cross-ventilation: Open windows on opposite sides of the room when outdoor temperatures allow, and use fans to move air through.
• Close blackout curtains during the day to keep solar heat from building up in the room before bedtime.

Two Mistake To Avoid

Fixing only the room while leaving heat-trapping bedding in place is a common miss. The same happens in reverse — cooling the mattress while the room stays warm. Address both together. Also, rotate your mattress every few months. Body impressions hold extra heat, and rotating keeps the surface even and cooler.